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2006 chevy trailblazer_ls
7 Posts
Discussion Starter · #1 ·
Hey everybody. I'm generally a lurker on the forums since I usually find what I'm looking for has been answered/discussed 10 times over before I get to the party, but this time its not the case.

Here is the skinny:

-06 TB LS - i6 4x4 with GU6 3.42 Non-locking Rear End 189,000 miles

-Whining/whistling/groaning (not grinding) noise from rear end. Almost sounds like blowing air over a half empty beer bottle mixed with an electric motor. Pitch is higher at higher speeds.

-Rear end noise becoming more pronounced. Used to only be heard at "highway speeds" (50-75 mph) now can be heard at a lower pitch around 35-40 mph. Used to be able to drown the sound out with the radio but that isn't the case anymore.

-Only present when on the accelerator. Noise disappears when coasting and braking. Reoccurs as gas is reapplied.

-Same going straight or turning, coasting flat or down hill.

So digesting the info above I'm leaning towards a bad pinion bearing but I have ZERO slop from the shaft to the rear diff so I'm not 100%. Last fluid change did not resolve or even improve this. It is now time to change the fluids again though. The fact that it only happens when on the accelerator really eliminates a lot of issues. I'm hoping there is someone else out there that has seen this and can point me in the right direction. Thanks for your time!

*Moved from OEM issues after no hits*
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